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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../../cpp/types/rank.html below:

std::rank - cppreference.com

template< class T > struct rank;

(since C++11)

If T is an array type, provides the member constant value equal to the number of dimensions of the array. For any other type, value is â0â.

If the program adds specializations for std::rank or std::rank_v(since C++17), the behavior is undefined.

[edit] Helper variable template template< class T > constexpr std::size_t rank_v = rank<T>::value; (since C++17) Inherited from std::integral_constant Member constants the number of dimensions of T or zero
(public static member constant) Member functions converts the object to std::size_t, returns value
(public member function) returns value
(public member function) Member types [edit] Possible implementation [edit] Example

#include <type_traits>
 
static_assert(std::rank<int>{} == 0);
static_assert(std::rank<int[5]>{} == 1);
static_assert(std::rank<int[5][5]>{} == 2);
static_assert(std::rank<int[][5][5]>{} == 3);
 
int main()
{
    [[maybe_unused]] int ary[][3] = {{1, 2, 3}};
 
    // The rank of reference type, e.g., ary[0], that is int(&)[3], is 0:
    static_assert(std::rank_v<decltype(ary[0])> == 0);
    static_assert(std::is_same_v<decltype(ary[0]), int(&)[3]>);
 
    // The solution is to remove the reference type.
    static_assert(std::rank_v<std::remove_cvref_t<decltype(ary[0])>> == 1);
}

[edit] See also checks if a type is an array type
(class template) [edit] obtains the size of an array type along a specified dimension
(class template) [edit] removes one extent from the given array type
(class template) [edit] removes all extents from the given array type
(class template) [edit]

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